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SM1350AAQM bảng dữ liệu(PDF) 9 Page - Nippon Precision Circuits Inc

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Giải thích chi tiết về linh kiện  High Tone Quality Melody IC
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nhà sản xuất  NPC [Nippon Precision Circuits Inc]
Trang chủ  http://www.npc.co.jp/en
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SM1350AAQM
SEIKO NPC CORPORATION - 9
Melody Output Circuit
The volume control circuit comprises a P-channel current-summing D/A converter, a built-in constant-current source
and an external variable resistor.
Output circuit (A-class)
The A-class output circuit comprises a single 10-bit D/A converter with current output on SP. The D/A converter is set
ON immediately after the oscillator starts, and the current output that results is the center point above and below which
the converter current output varies in response to the waveform amplitude. The SP output is current-to-voltage
converted for connection to audio equipment or amplifiers. The 4 sound generator waveforms are time multiplexed, so
an integrating circuit must be connected between SP and the amplifier to recover the signal.
VDD
BUSYN
VSS
SP
VOL
V
DD
V
SS
SPEAKER
AMP
Figure 4. Output circuit (A-class)
Pin Functions
STN pin
Melody start signal. Melody starts when LOW is detected.
One-shot melody output (LH=LOW)
One-shot melody is a melody control that stops melody after it play to the last of the melody when there is a start trigger.
When STN goes LOW during melody output, the melody specified with S0 to S3 is played
#N
#N
#M
#M
STN
S0 to S3
Melody Output
(SP pin)
Figure 5. One-shot mode
One-shot mode repeat function
In one-shot melody mode, the output repeats the same melody while STN is LOW. When STN goes HIGH, the output
continues until the end of the currently playing melody and then stops.
#N
#N
#N
STN
Melody Output
(SP pin)
Figure 6. One-shot melody repeat timing


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